Integrated control device for high-voltage dynamic reactive power compensation

Abstract

The invention relates to an integrated control device for high-voltage dynamic reactive power compensation, which belongs to the field of AC transmission. The integrated control device for high-voltage dynamic reactive power compensation comprises a main control part, a high-voltage isolation part and a power unit control part which are sequentially connected and are placed in the same cabinet body, wherein the main control part comprises a high-voltage isolation power supply primary side and a main control module; the high-voltage isolation part comprises an isolation transformer and an optical fiber; and the power unit control part comprises a plurality of power unit control modules. The multipath high-voltage isolation power supply, the main control unit module and the power unit control modules for operation of the high-voltage SVG are integrated, the modules are placed in the cabinet body according to a certain structure, the SVG space occupancy is reduced on the whole, the SVG itself integration and maintenance difficulty is reduced, the SVG system device reliability is enhanced, and the integrated control device for high-voltage dynamic reactive power compensation has the advantages that the real-time performance is good; the isolation ability is strong; the reliability is high; and batch production is facilitated.

Description

technical field [0001] The invention relates to the field of AC power transmission, in particular to an integrated control device for high-voltage dynamic reactive power compensation. Background technique [0002] In recent years, with the continuous advancement of science and technology, the application of power electronic equipment in industry has gradually increased. While power electronic devices have brought huge benefits to people, they have also caused increasingly serious pollution in the power grid. With the flexible AC transmission With the continuous development of technology (Flexible AC Transmission System, referred to as FACTS), a dynamic reactive power compensation device (Static Var Generator, referred to as SVG) was born. The high-voltage SVG realizes reactive power compensation and harmonics by injecting currents with equal currents and opposite directions. Inhibition is an important device of FACTS. [0003] Most of the high-voltage SVG in the industry ad...

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Problems solved by technology

[0004] The power unit is the component unit of SVG equipment. Because the power unit generally requires small size and low cost, when high voltage is involved in the design of the power unit, it is necessary to fully consider the spatial layout of the control circuit, power supply part, and communication isolation circuit, resulting in power unit The volume reduction is limited. In the patent "CN102158336.A Multi-channel isolated high-speed intelligent transceiver device and method for power electronic systems", a multi-channel isolated communication method is proposed. Since it involves multiple analog quantities and The transmission of digital quantity adopts FPGA module, the structure and design are too complicated, and it can’t realize the purpose of reducing volume and cost in essence, so it can be used as a research direction; the high-voltage SVG power unit module needs power supply, and currently The best way is to use high-voltage insulating power frequency transformers. Because power frequency transformers are bulky and expensive, the volume and cost of power modules are generally high. At the same time, some researchers are also studying how to use high frequency transformers. The magnetic transformer replaces the expensive and bulky power frequency transformer. The patent "CN101662214A High Voltage Isolated Switching Power Supply and Multiple Output Isolated Switching Power Supply System" proposes a magnetically isolated multi-output switching power supply for distributed power electronic equipment. It provides convenience; the patent "CN102291010A series bus type multi-channel DC output high-voltage high-frequency isolated power supply" optimizes the original and secondary side design of the power supply on the basis of the magnetically isolated multi-channel output switching power supply, which improves the availability of the power supply, but In the process of use, there are still some problems that cannot be solved:

[0005] 1. Due to the patent "CN102291010A series bus type multi-channel DC output high-voltage high-frequency isolated power supply", the design of the secondary side of the power supply has no feedback voltage to the primary side, and it is an open-loop system. Therefore, the multi-channel output high-frequency isolated power supply Poor load capacity

[0006] 2. Due to the patent "CN201010297872.0 A Magnetic Isolation Feedback Circuit for Switching Power Supply", a feedback method based on magnetic isolation was proposed. Frequency transformer design is different, the characteristics of the transformer are different, and the load of the feedback winding of the magnetic ring transformer is difficult to be the same as the load of the actual power module. Based on the above reasons, the effect of the feedback control is not good.

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